diff --git a/scripts/render.sh b/scripts/render.sh
index d4dedc9..0123cad 100755
--- a/scripts/render.sh
+++ b/scripts/render.sh
@@ -1,2 +1,2 @@
 #!/bin/sh
-/home/osm/bin/renderpoly.py --style /home/osm/openstreetmap-carto/osm.xml --poly /home/osm/import/$1/$1.poly -z 0 16
+/home/osm/bin/renderpoly.py --style /home/osm/openstreetmap-carto/osm.xml --poly /home/osm/import/$1/$1.poly --threads 4 -z 0 16